#ifndef VJBSDHDR_H
#define VJBSDHDR_H

#include "lwip/tcp.h"

/*
 * Structure of an internet header, naked of options.
 *
 * We declare ip_len and ip_off to be short, rather than u_short
 * pragmatically since otherwise unsigned comparisons can result
 * against negative integers quite easily, and fail in subtle ways.
 */
PACK_STRUCT_BEGIN
struct ip
{
#if defined(NO_CHAR_BITFIELDS)
    u_char ip_hl_v;  /* bug in GCC for mips means the bitfield stuff will sometimes break - so we use a char for both and get round it with macro's instead... */
#else
#if BYTE_ORDER == LITTLE_ENDIAN
    unsigned ip_hl : 4,          /* header length */
             ip_v : 4;           /* version */
#elif BYTE_ORDER == BIG_ENDIAN
    unsigned ip_v : 4,           /* version */
             ip_hl : 4;          /* header length */
#else
    COMPLAIN - NO INT8U ORDER SELECTED !
#endif
#endif
    u_char ip_tos;               /* type of service */
    u_short ip_len;              /* total length */
    u_short ip_id;               /* identification */
    u_short ip_off;              /* fragment offset field */
#define  IP_DF 0x4000            /* dont fragment flag */
#define  IP_MF 0x2000            /* more fragments flag */
#define  IP_OFFMASK 0x1fff       /* mask for fragmenting bits */
    u_char ip_ttl;               /* time to live */
    u_char ip_p;                 /* protocol */
    u_short ip_sum;              /* checksum */
    struct  in_addr ip_src, ip_dst; /* source and dest address */
};
PACK_STRUCT_END

typedef u32_t tcp_seq;

/*
 * TCP header.
 * Per RFC 793, September, 1981.
 */
PACK_STRUCT_BEGIN
struct tcphdr
{
    u_short th_sport;   /* source port */
    u_short th_dport;   /* destination port */
    tcp_seq th_seq;     /* sequence number */
    tcp_seq th_ack;     /* acknowledgement number */
#if defined(NO_CHAR_BITFIELDS)
    u_char th_x2_off;
#else
#if BYTE_ORDER == LITTLE_ENDIAN
    unsigned th_x2 : 4, /* (unused) */
             th_off : 4; /* data offset */
#endif
#if BYTE_ORDER == BIG_ENDIAN
    unsigned th_off : 4, /* data offset */
             th_x2 : 4; /* (unused) */
#endif
#endif
    u_char th_flags;
    u_short th_win;     /* window */
    u_short th_sum;     /* checksum */
    u_short th_urp;     /* urgent pointer */
};
PACK_STRUCT_END

#endif /* VJBSDHDR_H */
